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| = LCGT Timing System = | ## page was renamed from LCGT/subgroup/ifo/digital/Timing = KAGRA Timing System = |
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| The LCGT timing system will be a dead copy of the advanced LIGO timing system :-) | ---- |
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| == Functions == * Provides accurate time information to all the stations in the LCGT. * The system provides 2^N Hz clock signals synchronized with the GPS seconds. * The system also distributes the absolute time information to the DAQ hardwares so that each sample recorded will be unambiguously associated with an absolute GPS second. |
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| == LIGO Documents == | == Note of the Meeting with Zsuzsa (Jul 15, 2016 at Columbia University) == === Suggestions (random order) === * You may not want more IRIG-B boards because there is Dsub output on the back of IRIG-B board with which we can convert to BNC to use more outputs. * It's better to connect two GPS antennas to Master board so that one can be used when the other signal is lost. * In the master board, VCXO is not available in the market anymore. However Szusza has spares. * In the comparator board, there is one chip which gets very hot. Make sure to cool it down. * Check if the leap second is correctly compensated in the oldest IRIG-B (one arrived on 5/7/2012, installed in the front room). iKAGRA timing might have been off 1 sec! [[http://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=5386|our note related to the new order]] == Reference == ==== LIGO Documents ==== |
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| * [[https://dcc.ligo.org/cgi-bin/DocDB/ShowDocument?docid=485|Quick Start Guide Optical Timing Distribution System Advanced LIGO]] * [[https://dcc.ligo.org/cgi-bin/DocDB/ShowDocument?docid=492|Timing Master Module/Fanout Module]] * [[https://dcc.ligo.org/cgi-bin/DocDB/ShowDocument?docid=21665|Circuit Schematic]] * [[https://dcc.ligo.org/cgi-bin/DocDB/ShowDocument?docid=493|Slave Module]] |
KAGRA Timing System
Note of the Meeting with Zsuzsa (Jul 15, 2016 at Columbia University)
Suggestions (random order)
- You may not want more IRIG-B boards because there is Dsub output on the back of IRIG-B board with which we can convert to BNC to use more outputs.
- It's better to connect two GPS antennas to Master board so that one can be used when the other signal is lost.
- In the master board, VCXO is not available in the market anymore. However Szusza has spares.
- In the comparator board, there is one chip which gets very hot. Make sure to cool it down.
- Check if the leap second is correctly compensated in the oldest IRIG-B (one arrived on 5/7/2012, installed in the front room). iKAGRA timing might have been off 1 sec!
our note related to the new order
Reference